Oct 29, 2021 · RESTEK 25882 Filter Vial, 0.2 um, with Pre-Slit Cap, PTFE RESTEK 25882 Filter Vial, 0.2um, w/ Pre-Slit Cap, PTFE, Green Cap, Pack of 100. Ultra-low dead volume allows you to filter as little as 10 µL of sample and still obtain enough filtrate to make a 2 µL injection.